Like all automaton abilities, the automaton must be deployed and able to use a job ability for the action to be used. If Heady Artifice is used while the automaton is passive, amnesic, asleep, terrorized, or otherwise unable to act, it will use its corresponding ability once it is able, assuming it has not been deactivated and you have not changed zones.
Upon using Manafont and Chainspell the automaton will not be bound by its universal timers, it will cast continuously as long as it has sufficient MP and the effect is active. This ability does not affect the spell priority order.
/ja "Heady Artifice" <me>
Since Heady Artifice is a one hour special, some people prefer not to make a macro for it to prevent unintentional activation.